Its pretty standard, troops defend objectives and vindicator targets clusters of units. My daemon princes will largely target enemy armour or high priority targets. The raptors make for agile tank hunters. Raptors are not optimal I understand, but this role could allow them to actually be useful.

Pretty good list. You could probably use a couple more melta guns, since you lack long-range tank busting. Therefore, drop the plasmas and take two additional melta
The raptor squad, if taken, should be kitted out a little more. They just don't accomplish much for 140 points. I'd recommend you add two more bodies, along with a champion with a fist, plus an icon. Although, if you're looking for a competitive build, then drop them entirely. Instead, take a pair of oblits or a defiler.

Prince: BoC is ok, but awfully expensive for a single S8 shot. Might consider dropping this too if you're in need of points.

Pretty good list. You could probably use a couple more melta guns, since you lack long-range tank busting. Therefore, drop the plasmas and take two additional meltas.

The raptor squad should be kitted out a little more. They just don't accomplish much for 140 points. I'd recommend you add two more bodies, along with a champion with a fist, plus an icon. Although, if you're looking for a competitive build, then drop them entirely. Instead, take a pair of oblits or a defiler.

Prince: BoC is ok, but awfully expensive for a single S8 shot. Might consider dropping this too if you're in need of points.